v3.26.1
Shareholder Report, Holdings (Details)
Mar. 31, 2026
C000002851 | The Bank of New York Mellon Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 5.00%
C000002851 | Chevron Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 3.30%
C000002851 | Newmont Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 3.10%
C000002851 | Genuine Parts Co.  
Holdings [Line Items]  
Percent of Net Asset Value 3.10%
C000002851 | Deere & Co.  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
C000002851 | GATX Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 2.70%
C000002851 | State Street Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 2.70%
C000002851 | National Fuel Gas Co.  
Holdings [Line Items]  
Percent of Net Asset Value 2.30%
C000002851 | Textron Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 1.90%
C000002851 | Parker-Hannifin Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 1.90%
C000002851 | InvestmentType_Common Stocks  
Holdings [Line Items]  
Percent of Net Asset Value 99.60%
C000002851 | InvestmentType_U.S. Government Obligations  
Holdings [Line Items]  
Percent of Net Asset Value 0.20%
C000002851 | Financial Services  
Holdings [Line Items]  
Percent of Net Asset Value 16.20%
C000002851 | Food and Beverage  
Holdings [Line Items]  
Percent of Net Asset Value 12.70%
C000002851 | Diversified Industrial  
Holdings [Line Items]  
Percent of Net Asset Value 7.00%
C000002851 | Equipment and Supplies  
Holdings [Line Items]  
Percent of Net Asset Value 6.20%
C000002851 | Health Care  
Holdings [Line Items]  
Percent of Net Asset Value 5.80%
C000002851 | Energy and Utilities: Oil  
Holdings [Line Items]  
Percent of Net Asset Value 5.10%
C000002851 | Machinery  
Holdings [Line Items]  
Percent of Net Asset Value 4.20%
C000002851 | Metals and Mining  
Holdings [Line Items]  
Percent of Net Asset Value 4.20%
C000002851 | Other Industry sectors  
Holdings [Line Items]  
Percent of Net Asset Value 38.40%
C000243164 | The Bank of New York Mellon Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 5.00%
C000243164 | Chevron Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 3.30%
C000243164 | Newmont Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 3.10%
C000243164 | Genuine Parts Co.  
Holdings [Line Items]  
Percent of Net Asset Value 3.10%
C000243164 | Deere & Co.  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
C000243164 | GATX Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 2.70%
C000243164 | State Street Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 2.70%
C000243164 | National Fuel Gas Co.  
Holdings [Line Items]  
Percent of Net Asset Value 2.30%
C000243164 | Textron Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 1.90%
C000243164 | Parker-Hannifin Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 1.90%
C000243164 | InvestmentType_Common Stocks  
Holdings [Line Items]  
Percent of Net Asset Value 99.60%
C000243164 | InvestmentType_U.S. Government Obligations  
Holdings [Line Items]  
Percent of Net Asset Value 0.20%
C000243164 | Financial Services  
Holdings [Line Items]  
Percent of Net Asset Value 16.20%
C000243164 | Food and Beverage  
Holdings [Line Items]  
Percent of Net Asset Value 12.70%
C000243164 | Diversified Industrial  
Holdings [Line Items]  
Percent of Net Asset Value 7.00%
C000243164 | Equipment and Supplies  
Holdings [Line Items]  
Percent of Net Asset Value 6.20%
C000243164 | Health Care  
Holdings [Line Items]  
Percent of Net Asset Value 5.80%
C000243164 | Energy and Utilities: Oil  
Holdings [Line Items]  
Percent of Net Asset Value 5.10%
C000243164 | Machinery  
Holdings [Line Items]  
Percent of Net Asset Value 4.20%
C000243164 | Metals and Mining  
Holdings [Line Items]  
Percent of Net Asset Value 4.20%
C000243164 | Other Industry sectors  
Holdings [Line Items]  
Percent of Net Asset Value 38.40%
C000061072 | The Bank of New York Mellon Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 5.00%
C000061072 | Chevron Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 3.30%
C000061072 | Newmont Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 3.10%
C000061072 | Genuine Parts Co.  
Holdings [Line Items]  
Percent of Net Asset Value 3.10%
C000061072 | Deere & Co.  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
C000061072 | GATX Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 2.70%
C000061072 | State Street Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 2.70%
C000061072 | National Fuel Gas Co.  
Holdings [Line Items]  
Percent of Net Asset Value 2.30%
C000061072 | Textron Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 1.90%
C000061072 | Parker-Hannifin Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 1.90%
C000061072 | InvestmentType_Common Stocks  
Holdings [Line Items]  
Percent of Net Asset Value 99.60%
C000061072 | InvestmentType_U.S. Government Obligations  
Holdings [Line Items]  
Percent of Net Asset Value 0.20%
C000061072 | Financial Services  
Holdings [Line Items]  
Percent of Net Asset Value 16.20%
C000061072 | Food and Beverage  
Holdings [Line Items]  
Percent of Net Asset Value 12.70%
C000061072 | Diversified Industrial  
Holdings [Line Items]  
Percent of Net Asset Value 7.00%
C000061072 | Equipment and Supplies  
Holdings [Line Items]  
Percent of Net Asset Value 6.20%
C000061072 | Health Care  
Holdings [Line Items]  
Percent of Net Asset Value 5.80%
C000061072 | Energy and Utilities: Oil  
Holdings [Line Items]  
Percent of Net Asset Value 5.10%
C000061072 | Machinery  
Holdings [Line Items]  
Percent of Net Asset Value 4.20%
C000061072 | Metals and Mining  
Holdings [Line Items]  
Percent of Net Asset Value 4.20%
C000061072 | Other Industry sectors  
Holdings [Line Items]  
Percent of Net Asset Value 38.40%
C000002850 | The Bank of New York Mellon Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 5.00%
C000002850 | Chevron Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 3.30%
C000002850 | Newmont Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 3.10%
C000002850 | Genuine Parts Co.  
Holdings [Line Items]  
Percent of Net Asset Value 3.10%
C000002850 | Deere & Co.  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
C000002850 | GATX Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 2.70%
C000002850 | State Street Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 2.70%
C000002850 | National Fuel Gas Co.  
Holdings [Line Items]  
Percent of Net Asset Value 2.30%
C000002850 | Textron Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 1.90%
C000002850 | Parker-Hannifin Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 1.90%
C000002850 | InvestmentType_Common Stocks  
Holdings [Line Items]  
Percent of Net Asset Value 99.60%
C000002850 | InvestmentType_U.S. Government Obligations  
Holdings [Line Items]  
Percent of Net Asset Value 0.20%
C000002850 | Financial Services  
Holdings [Line Items]  
Percent of Net Asset Value 16.20%
C000002850 | Food and Beverage  
Holdings [Line Items]  
Percent of Net Asset Value 12.70%
C000002850 | Diversified Industrial  
Holdings [Line Items]  
Percent of Net Asset Value 7.00%
C000002850 | Equipment and Supplies  
Holdings [Line Items]  
Percent of Net Asset Value 6.20%
C000002850 | Health Care  
Holdings [Line Items]  
Percent of Net Asset Value 5.80%
C000002850 | Energy and Utilities: Oil  
Holdings [Line Items]  
Percent of Net Asset Value 5.10%
C000002850 | Machinery  
Holdings [Line Items]  
Percent of Net Asset Value 4.20%
C000002850 | Metals and Mining  
Holdings [Line Items]  
Percent of Net Asset Value 4.20%
C000002850 | Other Industry sectors  
Holdings [Line Items]  
Percent of Net Asset Value 38.40%
C000203681 | TrustCo Bank Corp. NY  
Holdings [Line Items]  
Percent of Net Asset Value 4.00%
C000203681 | Capital One Financial Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 4.00%
C000203681 | First Citizens BancShares Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 3.90%
C000203681 | First American Financial Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 3.70%
C000203681 | Ally Financial Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
C000203681 | Toyota Motor Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 3.50%
C000203681 | E-L Financial Corp. Ltd.  
Holdings [Line Items]  
Percent of Net Asset Value 3.40%
C000203681 | Cavco Industries Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 3.30%
C000203681 | Credit Agricole SA  
Holdings [Line Items]  
Percent of Net Asset Value 3.20%
C000203681 | Daimler Truck Holding AG  
Holdings [Line Items]  
Percent of Net Asset Value 3.20%
C000203681 | InvestmentType_Common Stocks  
Holdings [Line Items]  
Percent of Net Asset Value 90.60%
C000203681 | InvestmentType_U.S. Government Obligations  
Holdings [Line Items]  
Percent of Net Asset Value 9.30%
C000203681 | Other Industry sectors  
Holdings [Line Items]  
Percent of Net Asset Value 11.70%
C000203681 | Banks  
Holdings [Line Items]  
Percent of Net Asset Value 29.70%
C000203681 | Insurance  
Holdings [Line Items]  
Percent of Net Asset Value 13.30%
C000203681 | Diversified Banks  
Holdings [Line Items]  
Percent of Net Asset Value 11.20%
C000203681 | U.S. Government Obligations  
Holdings [Line Items]  
Percent of Net Asset Value 9.30%
C000203681 | Automobiles  
Holdings [Line Items]  
Percent of Net Asset Value 7.70%
C000203681 | Consumer Finance  
Holdings [Line Items]  
Percent of Net Asset Value 7.50%
C000203681 | Homebuilders  
Holdings [Line Items]  
Percent of Net Asset Value 5.70%
C000203681 | Investment Management  
Holdings [Line Items]  
Percent of Net Asset Value 3.80%
C000203683 | TrustCo Bank Corp. NY  
Holdings [Line Items]  
Percent of Net Asset Value 4.00%
C000203683 | Capital One Financial Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 4.00%
C000203683 | First Citizens BancShares Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 3.90%
C000203683 | First American Financial Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 3.70%
C000203683 | Ally Financial Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
C000203683 | Toyota Motor Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 3.50%
C000203683 | E-L Financial Corp. Ltd.  
Holdings [Line Items]  
Percent of Net Asset Value 3.40%
C000203683 | Cavco Industries Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 3.30%
C000203683 | Credit Agricole SA  
Holdings [Line Items]  
Percent of Net Asset Value 3.20%
C000203683 | Daimler Truck Holding AG  
Holdings [Line Items]  
Percent of Net Asset Value 3.20%
C000203683 | InvestmentType_Common Stocks  
Holdings [Line Items]  
Percent of Net Asset Value 90.60%
C000203683 | InvestmentType_U.S. Government Obligations  
Holdings [Line Items]  
Percent of Net Asset Value 9.30%
C000203683 | Other Industry sectors  
Holdings [Line Items]  
Percent of Net Asset Value 11.70%
C000203683 | Banks  
Holdings [Line Items]  
Percent of Net Asset Value 29.70%
C000203683 | Insurance  
Holdings [Line Items]  
Percent of Net Asset Value 13.30%
C000203683 | Diversified Banks  
Holdings [Line Items]  
Percent of Net Asset Value 11.20%
C000203683 | U.S. Government Obligations  
Holdings [Line Items]  
Percent of Net Asset Value 9.30%
C000203683 | Automobiles  
Holdings [Line Items]  
Percent of Net Asset Value 7.70%
C000203683 | Consumer Finance  
Holdings [Line Items]  
Percent of Net Asset Value 7.50%
C000203683 | Homebuilders  
Holdings [Line Items]  
Percent of Net Asset Value 5.70%
C000203683 | Investment Management  
Holdings [Line Items]  
Percent of Net Asset Value 3.80%
C000203680 | TrustCo Bank Corp. NY  
Holdings [Line Items]  
Percent of Net Asset Value 4.00%
C000203680 | Capital One Financial Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 4.00%
C000203680 | First Citizens BancShares Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 3.90%
C000203680 | First American Financial Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 3.70%
C000203680 | Ally Financial Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
C000203680 | Toyota Motor Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 3.50%
C000203680 | E-L Financial Corp. Ltd.  
Holdings [Line Items]  
Percent of Net Asset Value 3.40%
C000203680 | Cavco Industries Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 3.30%
C000203680 | Credit Agricole SA  
Holdings [Line Items]  
Percent of Net Asset Value 3.20%
C000203680 | Daimler Truck Holding AG  
Holdings [Line Items]  
Percent of Net Asset Value 3.20%
C000203680 | InvestmentType_Common Stocks  
Holdings [Line Items]  
Percent of Net Asset Value 90.60%
C000203680 | InvestmentType_U.S. Government Obligations  
Holdings [Line Items]  
Percent of Net Asset Value 9.30%
C000203680 | Other Industry sectors  
Holdings [Line Items]  
Percent of Net Asset Value 11.70%
C000203680 | Banks  
Holdings [Line Items]  
Percent of Net Asset Value 29.70%
C000203680 | Insurance  
Holdings [Line Items]  
Percent of Net Asset Value 13.30%
C000203680 | Diversified Banks  
Holdings [Line Items]  
Percent of Net Asset Value 11.20%
C000203680 | U.S. Government Obligations  
Holdings [Line Items]  
Percent of Net Asset Value 9.30%
C000203680 | Automobiles  
Holdings [Line Items]  
Percent of Net Asset Value 7.70%
C000203680 | Consumer Finance  
Holdings [Line Items]  
Percent of Net Asset Value 7.50%
C000203680 | Homebuilders  
Holdings [Line Items]  
Percent of Net Asset Value 5.70%
C000203680 | Investment Management  
Holdings [Line Items]  
Percent of Net Asset Value 3.80%
C000203682 | TrustCo Bank Corp. NY  
Holdings [Line Items]  
Percent of Net Asset Value 4.00%
C000203682 | Capital One Financial Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 4.00%
C000203682 | First Citizens BancShares Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 3.90%
C000203682 | First American Financial Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 3.70%
C000203682 | Ally Financial Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
C000203682 | Toyota Motor Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 3.50%
C000203682 | E-L Financial Corp. Ltd.  
Holdings [Line Items]  
Percent of Net Asset Value 3.40%
C000203682 | Cavco Industries Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 3.30%
C000203682 | Credit Agricole SA  
Holdings [Line Items]  
Percent of Net Asset Value 3.20%
C000203682 | Daimler Truck Holding AG  
Holdings [Line Items]  
Percent of Net Asset Value 3.20%
C000203682 | InvestmentType_Common Stocks  
Holdings [Line Items]  
Percent of Net Asset Value 90.60%
C000203682 | InvestmentType_U.S. Government Obligations  
Holdings [Line Items]  
Percent of Net Asset Value 9.30%
C000203682 | Other Industry sectors  
Holdings [Line Items]  
Percent of Net Asset Value 11.70%
C000203682 | Banks  
Holdings [Line Items]  
Percent of Net Asset Value 29.70%
C000203682 | Insurance  
Holdings [Line Items]  
Percent of Net Asset Value 13.30%
C000203682 | Diversified Banks  
Holdings [Line Items]  
Percent of Net Asset Value 11.20%
C000203682 | U.S. Government Obligations  
Holdings [Line Items]  
Percent of Net Asset Value 9.30%
C000203682 | Automobiles  
Holdings [Line Items]  
Percent of Net Asset Value 7.70%
C000203682 | Consumer Finance  
Holdings [Line Items]  
Percent of Net Asset Value 7.50%
C000203682 | Homebuilders  
Holdings [Line Items]  
Percent of Net Asset Value 5.70%
C000203682 | Investment Management  
Holdings [Line Items]  
Percent of Net Asset Value 3.80%
C000002861 | Energy Transfer LP  
Holdings [Line Items]  
Percent of Net Asset Value 9.10%
C000002861 | AT&T Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 9.10%
C000002861 | Enterprise Products Partners LP  
Holdings [Line Items]  
Percent of Net Asset Value 8.30%
C000002861 | VICI Properties Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 8.00%
C000002861 | Franklin BSP Realty Trust Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 7.60%
C000002861 | Blackstone Mortgage Trust Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 5.20%
C000002861 | Kinder Morgan Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 4.80%
C000002861 | Kimbell Royalty Partners LP  
Holdings [Line Items]  
Percent of Net Asset Value 4.40%
C000002861 | ATN International Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 4.30%
C000002861 | XPLR Infrastructure LP  
Holdings [Line Items]  
Percent of Net Asset Value 4.10%
C000002861 | InvestmentType_Common Stocks  
Holdings [Line Items]  
Percent of Net Asset Value 91.60%
C000002861 | InvestmentType_U.S. Government Obligations  
Holdings [Line Items]  
Percent of Net Asset Value 1.70%
C000002861 | InvestmentType_Preferred Stocks  
Holdings [Line Items]  
Percent of Net Asset Value 6.80%
C000002861 | InvestmentType_Exchange Traded Call Options Written  
Holdings [Line Items]  
Percent of Net Asset Value (0.10%)
C000002861 | InvestmentType_Exchange Traded Put Options Written  
Holdings [Line Items]  
Percent of Net Asset Value (0.10%)
C000002861 | Financial Services  
Holdings [Line Items]  
Percent of Net Asset Value 9.90%
C000002861 | Food and Beverage  
Holdings [Line Items]  
Percent of Net Asset Value 4.10%
C000002861 | Health Care  
Holdings [Line Items]  
Percent of Net Asset Value 4.50%
C000002861 | Other Industry sectors  
Holdings [Line Items]  
Percent of Net Asset Value 5.00%
C000002861 | Energy and Utilities  
Holdings [Line Items]  
Percent of Net Asset Value 33.20%
C000002861 | Real Estate Investment Trusts  
Holdings [Line Items]  
Percent of Net Asset Value 23.50%
C000002861 | Telecommunications  
Holdings [Line Items]  
Percent of Net Asset Value 13.30%
C000002861 | Automotive: Parts and Accessories  
Holdings [Line Items]  
Percent of Net Asset Value 3.90%
C000002861 | Computer Software and Services  
Holdings [Line Items]  
Percent of Net Asset Value 2.50%
C000002860 | Energy Transfer LP  
Holdings [Line Items]  
Percent of Net Asset Value 9.10%
C000002860 | AT&T Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 9.10%
C000002860 | Enterprise Products Partners LP  
Holdings [Line Items]  
Percent of Net Asset Value 8.30%
C000002860 | VICI Properties Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 8.00%
C000002860 | Franklin BSP Realty Trust Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 7.60%
C000002860 | Blackstone Mortgage Trust Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 5.20%
C000002860 | Kinder Morgan Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 4.80%
C000002860 | Kimbell Royalty Partners LP  
Holdings [Line Items]  
Percent of Net Asset Value 4.40%
C000002860 | ATN International Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 4.30%
C000002860 | XPLR Infrastructure LP  
Holdings [Line Items]  
Percent of Net Asset Value 4.10%
C000002860 | InvestmentType_Common Stocks  
Holdings [Line Items]  
Percent of Net Asset Value 91.60%
C000002860 | InvestmentType_U.S. Government Obligations  
Holdings [Line Items]  
Percent of Net Asset Value 1.70%
C000002860 | InvestmentType_Preferred Stocks  
Holdings [Line Items]  
Percent of Net Asset Value 6.80%
C000002860 | InvestmentType_Exchange Traded Call Options Written  
Holdings [Line Items]  
Percent of Net Asset Value (0.10%)
C000002860 | InvestmentType_Exchange Traded Put Options Written  
Holdings [Line Items]  
Percent of Net Asset Value (0.10%)
C000002860 | Financial Services  
Holdings [Line Items]  
Percent of Net Asset Value 9.90%
C000002860 | Food and Beverage  
Holdings [Line Items]  
Percent of Net Asset Value 4.10%
C000002860 | Health Care  
Holdings [Line Items]  
Percent of Net Asset Value 4.50%
C000002860 | Other Industry sectors  
Holdings [Line Items]  
Percent of Net Asset Value 5.00%
C000002860 | Energy and Utilities  
Holdings [Line Items]  
Percent of Net Asset Value 33.20%
C000002860 | Real Estate Investment Trusts  
Holdings [Line Items]  
Percent of Net Asset Value 23.50%
C000002860 | Telecommunications  
Holdings [Line Items]  
Percent of Net Asset Value 13.30%
C000002860 | Automotive: Parts and Accessories  
Holdings [Line Items]  
Percent of Net Asset Value 3.90%
C000002860 | Computer Software and Services  
Holdings [Line Items]  
Percent of Net Asset Value 2.50%
C000061074 | Energy Transfer LP  
Holdings [Line Items]  
Percent of Net Asset Value 9.10%
C000061074 | AT&T Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 9.10%
C000061074 | Enterprise Products Partners LP  
Holdings [Line Items]  
Percent of Net Asset Value 8.30%
C000061074 | VICI Properties Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 8.00%
C000061074 | Franklin BSP Realty Trust Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 7.60%
C000061074 | Blackstone Mortgage Trust Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 5.20%
C000061074 | Kinder Morgan Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 4.80%
C000061074 | Kimbell Royalty Partners LP  
Holdings [Line Items]  
Percent of Net Asset Value 4.40%
C000061074 | ATN International Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 4.30%
C000061074 | XPLR Infrastructure LP  
Holdings [Line Items]  
Percent of Net Asset Value 4.10%
C000061074 | InvestmentType_Common Stocks  
Holdings [Line Items]  
Percent of Net Asset Value 91.60%
C000061074 | InvestmentType_U.S. Government Obligations  
Holdings [Line Items]  
Percent of Net Asset Value 1.70%
C000061074 | InvestmentType_Preferred Stocks  
Holdings [Line Items]  
Percent of Net Asset Value 6.80%
C000061074 | InvestmentType_Exchange Traded Call Options Written  
Holdings [Line Items]  
Percent of Net Asset Value (0.10%)
C000061074 | InvestmentType_Exchange Traded Put Options Written  
Holdings [Line Items]  
Percent of Net Asset Value (0.10%)
C000061074 | Financial Services  
Holdings [Line Items]  
Percent of Net Asset Value 9.90%
C000061074 | Food and Beverage  
Holdings [Line Items]  
Percent of Net Asset Value 4.10%
C000061074 | Health Care  
Holdings [Line Items]  
Percent of Net Asset Value 4.50%
C000061074 | Other Industry sectors  
Holdings [Line Items]  
Percent of Net Asset Value 5.00%
C000061074 | Energy and Utilities  
Holdings [Line Items]  
Percent of Net Asset Value 33.20%
C000061074 | Real Estate Investment Trusts  
Holdings [Line Items]  
Percent of Net Asset Value 23.50%
C000061074 | Telecommunications  
Holdings [Line Items]  
Percent of Net Asset Value 13.30%
C000061074 | Automotive: Parts and Accessories  
Holdings [Line Items]  
Percent of Net Asset Value 3.90%
C000061074 | Computer Software and Services  
Holdings [Line Items]  
Percent of Net Asset Value 2.50%
C000002858 | Energy Transfer LP  
Holdings [Line Items]  
Percent of Net Asset Value 9.10%
C000002858 | AT&T Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 9.10%
C000002858 | Enterprise Products Partners LP  
Holdings [Line Items]  
Percent of Net Asset Value 8.30%
C000002858 | VICI Properties Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 8.00%
C000002858 | Franklin BSP Realty Trust Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 7.60%
C000002858 | Blackstone Mortgage Trust Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 5.20%
C000002858 | Kinder Morgan Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 4.80%
C000002858 | Kimbell Royalty Partners LP  
Holdings [Line Items]  
Percent of Net Asset Value 4.40%
C000002858 | ATN International Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 4.30%
C000002858 | XPLR Infrastructure LP  
Holdings [Line Items]  
Percent of Net Asset Value 4.10%
C000002858 | InvestmentType_Common Stocks  
Holdings [Line Items]  
Percent of Net Asset Value 91.60%
C000002858 | InvestmentType_U.S. Government Obligations  
Holdings [Line Items]  
Percent of Net Asset Value 1.70%
C000002858 | InvestmentType_Preferred Stocks  
Holdings [Line Items]  
Percent of Net Asset Value 6.80%
C000002858 | InvestmentType_Exchange Traded Call Options Written  
Holdings [Line Items]  
Percent of Net Asset Value (0.10%)
C000002858 | InvestmentType_Exchange Traded Put Options Written  
Holdings [Line Items]  
Percent of Net Asset Value (0.10%)
C000002858 | Financial Services  
Holdings [Line Items]  
Percent of Net Asset Value 9.90%
C000002858 | Food and Beverage  
Holdings [Line Items]  
Percent of Net Asset Value 4.10%
C000002858 | Health Care  
Holdings [Line Items]  
Percent of Net Asset Value 4.50%
C000002858 | Other Industry sectors  
Holdings [Line Items]  
Percent of Net Asset Value 5.00%
C000002858 | Energy and Utilities  
Holdings [Line Items]  
Percent of Net Asset Value 33.20%
C000002858 | Real Estate Investment Trusts  
Holdings [Line Items]  
Percent of Net Asset Value 23.50%
C000002858 | Telecommunications  
Holdings [Line Items]  
Percent of Net Asset Value 13.30%
C000002858 | Automotive: Parts and Accessories  
Holdings [Line Items]  
Percent of Net Asset Value 3.90%
C000002858 | Computer Software and Services  
Holdings [Line Items]  
Percent of Net Asset Value 2.50%
C000002855 | GATX Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 2.70%
C000002855 | Textron Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 1.60%
C000002855 | AMETEK Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 4.40%
C000002855 | Mueller Industries Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 3.50%
C000002855 | KKR & Co. Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 3.10%
C000002855 | Crane Co.  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
C000002855 | The Gorman-Rupp Co.  
Holdings [Line Items]  
Percent of Net Asset Value 2.50%
C000002855 | Graco Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 1.90%
C000002855 | Moog Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 1.70%
C000002855 | Rush Enterprises Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 1.70%
C000002855 | InvestmentType_Common Stocks  
Holdings [Line Items]  
Percent of Net Asset Value 98.20%
C000002855 | InvestmentType_U.S. Government Obligations  
Holdings [Line Items]  
Percent of Net Asset Value 1.60%
C000002855 | InvestmentType_Preferred Stocks  
Holdings [Line Items]  
Percent of Net Asset Value 0.10%
C000002855 | InvestmentType_Closed-End Funds  
Holdings [Line Items]  
Percent of Net Asset Value 0.10%
C000002855 | InvestmentType_Common Stocks – Securities Sold Short  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
C000002855 | Financial Services  
Holdings [Line Items]  
Percent of Net Asset Value 4.80%
C000002855 | Food and Beverage  
Holdings [Line Items]  
Percent of Net Asset Value 3.80%
C000002855 | Diversified Industrial  
Holdings [Line Items]  
Percent of Net Asset Value 10.50%
C000002855 | Equipment and Supplies  
Holdings [Line Items]  
Percent of Net Asset Value 19.90%
C000002855 | Other Industry sectors  
Holdings [Line Items]  
Percent of Net Asset Value 42.10%
C000002855 | Automotive: Parts and Accessories  
Holdings [Line Items]  
Percent of Net Asset Value 5.60%
C000002855 | Retail  
Holdings [Line Items]  
Percent of Net Asset Value 5.40%
C000002855 | Entertainment  
Holdings [Line Items]  
Percent of Net Asset Value 4.30%
C000002855 | Building and Construction  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
C000002857 | GATX Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 2.70%
C000002857 | Textron Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 1.60%
C000002857 | AMETEK Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 4.40%
C000002857 | Mueller Industries Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 3.50%
C000002857 | KKR & Co. Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 3.10%
C000002857 | Crane Co.  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
C000002857 | The Gorman-Rupp Co.  
Holdings [Line Items]  
Percent of Net Asset Value 2.50%
C000002857 | Graco Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 1.90%
C000002857 | Moog Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 1.70%
C000002857 | Rush Enterprises Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 1.70%
C000002857 | InvestmentType_Common Stocks  
Holdings [Line Items]  
Percent of Net Asset Value 98.20%
C000002857 | InvestmentType_U.S. Government Obligations  
Holdings [Line Items]  
Percent of Net Asset Value 1.60%
C000002857 | InvestmentType_Preferred Stocks  
Holdings [Line Items]  
Percent of Net Asset Value 0.10%
C000002857 | InvestmentType_Closed-End Funds  
Holdings [Line Items]  
Percent of Net Asset Value 0.10%
C000002857 | InvestmentType_Common Stocks – Securities Sold Short  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
C000002857 | Financial Services  
Holdings [Line Items]  
Percent of Net Asset Value 4.80%
C000002857 | Food and Beverage  
Holdings [Line Items]  
Percent of Net Asset Value 3.80%
C000002857 | Diversified Industrial  
Holdings [Line Items]  
Percent of Net Asset Value 10.50%
C000002857 | Equipment and Supplies  
Holdings [Line Items]  
Percent of Net Asset Value 19.90%
C000002857 | Other Industry sectors  
Holdings [Line Items]  
Percent of Net Asset Value 42.10%
C000002857 | Automotive: Parts and Accessories  
Holdings [Line Items]  
Percent of Net Asset Value 5.60%
C000002857 | Retail  
Holdings [Line Items]  
Percent of Net Asset Value 5.40%
C000002857 | Entertainment  
Holdings [Line Items]  
Percent of Net Asset Value 4.30%
C000002857 | Building and Construction  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
C000061073 | GATX Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 2.70%
C000061073 | Textron Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 1.60%
C000061073 | AMETEK Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 4.40%
C000061073 | Mueller Industries Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 3.50%
C000061073 | KKR & Co. Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 3.10%
C000061073 | Crane Co.  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
C000061073 | The Gorman-Rupp Co.  
Holdings [Line Items]  
Percent of Net Asset Value 2.50%
C000061073 | Graco Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 1.90%
C000061073 | Moog Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 1.70%
C000061073 | Rush Enterprises Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 1.70%
C000061073 | InvestmentType_Common Stocks  
Holdings [Line Items]  
Percent of Net Asset Value 98.20%
C000061073 | InvestmentType_U.S. Government Obligations  
Holdings [Line Items]  
Percent of Net Asset Value 1.60%
C000061073 | InvestmentType_Preferred Stocks  
Holdings [Line Items]  
Percent of Net Asset Value 0.10%
C000061073 | InvestmentType_Closed-End Funds  
Holdings [Line Items]  
Percent of Net Asset Value 0.10%
C000061073 | InvestmentType_Common Stocks – Securities Sold Short  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
C000061073 | Financial Services  
Holdings [Line Items]  
Percent of Net Asset Value 4.80%
C000061073 | Food and Beverage  
Holdings [Line Items]  
Percent of Net Asset Value 3.80%
C000061073 | Diversified Industrial  
Holdings [Line Items]  
Percent of Net Asset Value 10.50%
C000061073 | Equipment and Supplies  
Holdings [Line Items]  
Percent of Net Asset Value 19.90%
C000061073 | Other Industry sectors  
Holdings [Line Items]  
Percent of Net Asset Value 42.10%
C000061073 | Automotive: Parts and Accessories  
Holdings [Line Items]  
Percent of Net Asset Value 5.60%
C000061073 | Retail  
Holdings [Line Items]  
Percent of Net Asset Value 5.40%
C000061073 | Entertainment  
Holdings [Line Items]  
Percent of Net Asset Value 4.30%
C000061073 | Building and Construction  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
C000002854 | GATX Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 2.70%
C000002854 | Textron Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 1.60%
C000002854 | AMETEK Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 4.40%
C000002854 | Mueller Industries Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 3.50%
C000002854 | KKR & Co. Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 3.10%
C000002854 | Crane Co.  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
C000002854 | The Gorman-Rupp Co.  
Holdings [Line Items]  
Percent of Net Asset Value 2.50%
C000002854 | Graco Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 1.90%
C000002854 | Moog Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 1.70%
C000002854 | Rush Enterprises Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 1.70%
C000002854 | InvestmentType_Common Stocks  
Holdings [Line Items]  
Percent of Net Asset Value 98.20%
C000002854 | InvestmentType_U.S. Government Obligations  
Holdings [Line Items]  
Percent of Net Asset Value 1.60%
C000002854 | InvestmentType_Preferred Stocks  
Holdings [Line Items]  
Percent of Net Asset Value 0.10%
C000002854 | InvestmentType_Closed-End Funds  
Holdings [Line Items]  
Percent of Net Asset Value 0.10%
C000002854 | InvestmentType_Common Stocks – Securities Sold Short  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
C000002854 | Financial Services  
Holdings [Line Items]  
Percent of Net Asset Value 4.80%
C000002854 | Food and Beverage  
Holdings [Line Items]  
Percent of Net Asset Value 3.80%
C000002854 | Diversified Industrial  
Holdings [Line Items]  
Percent of Net Asset Value 10.50%
C000002854 | Equipment and Supplies  
Holdings [Line Items]  
Percent of Net Asset Value 19.90%
C000002854 | Other Industry sectors  
Holdings [Line Items]  
Percent of Net Asset Value 42.10%
C000002854 | Automotive: Parts and Accessories  
Holdings [Line Items]  
Percent of Net Asset Value 5.60%
C000002854 | Retail  
Holdings [Line Items]  
Percent of Net Asset Value 5.40%
C000002854 | Entertainment  
Holdings [Line Items]  
Percent of Net Asset Value 4.30%
C000002854 | Building and Construction  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%